Perhaps you should try some spelling variations:
"harvard world bank studies book series." » "harvard cold bank studies book series.", "harvard world urban studies book series.", "harvard world bank study book series.", "harvard world bank studies books series.", "harvard world bank studies ebook series."
"harvard world case studies from surveys." » "harvard cold case studies from surveys.", "harvard world case studies from survey.", "harvard world case studies firm surveys.", "harvard world case studies force surveys.", "harvard world class studies from surveys."

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (("harvard world bank studies book series.") OR ("harvard world case studies from surveys."))~.
• Removing quotes may allow a broader search: (( harvard world bank studies book series. ) or ( harvard world case studies from surveys. ))~.
• Adding a wildcard symbol may retrieve word variants: (("harvard world bank studies book series.") or ("harvard world case studies from surveys."))*.